1) 11х^2-6x-27=8x^2-6x
11x^2-6x-27-8x^2+6x=0
3x^2-27=0
3x^2=27
x^2=27/3
x^2=9
x=3
2) 26+5y-0,5y^2=2,5y^2+26
26+5y-0,5y^2-2,5y^2-26=0
5y-3y^2=0
y(5-3y)=0
y=0 5-3y=0
3y=5
y= 5/3
3)-7x^2+13x+9=-19+13x
-7x^2 +13x +9 +19 -13x=0
-7x^2 +28 =0
7x^2=28
x^2 = 4
x=2
4) 21z+11=11+17z-5z^2
21z+11-11-17z^2=0
21z-17z^2=0
z(21-17z)=0
z=0 17z=21
я= 21/17
5)(x-5)^2+ 4x = 25
x^2-10+25 +4x =25
x^2 +4x = 10
x (x+4)=10
x=10 x+4 =10
x=6
а) при x = -6
x²/2 - x/3 = 36/2 - (-6/3) = 18 + 2 = 20
при х = -1
x²/2 - x/3 = (-1)²/2 - (-1/3) = 1/2 + 1/3 = 5/6
при х = 0
x²/2 - x/3 = 0²/2 - 0/3 = 0 - 0 = 0
при х = 1
x²/2 - x/3 = 1²/2 - 1/3 = 1/2 - 1/3 = 1/6
при x = 2
x²/2 - x/3 = 2²/2 - 2/3 = 4/2 - 2/3 = 2 - 2/3 = 4/6 = 2/3
б) при x = -6
2x³ + x/2 = 2 · (-6)³ + (-6/2) = -432 - 3 = -435
при х = -1
2x³ + x/2 = 2 · (-1)³ + (-1/2) = -2 - 0,5 = -2,5
при х = 0
2x³ + x/2 = 2 · 0³ + 0/2 = 0 + 0 = 0
при х = 1
2x³ + x/2 = 2 · 1³ + 1/2 = 2 + 0,5 = 2,5
при х = 2
2x³ + x/2 = 2 · 2³ + 2/2 = 16 + 1 = 17
Привет!)
При х=1 и у=-0.6: